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/*
* Distributed under the OSI-approved Apache License, Version 2.0. See
* accompanying file Copyright.txt for details.
*
* bpWriter.c : C bindings version of bpWriter.cpp
*
* Created on: Aug 8, 2017
* Author: William F Godoy godoywf@ornl.gov
*/
#include <stdio.h> // printf
#include <stdlib.h> // malloc, free, exit
#include <adios2_c.h>
#if ADIOS2_USE_MPI
#include <mpi.h>
#endif
void check_error(const int error)
{
if (error)
{
printf("ERROR: %d\n", error);
exit(error);
}
}
void check_handler(const void *handler, const char *message)
{
if (handler == NULL)
{
printf("ERROR: invalid %s handler \n", message);
exit(EXIT_FAILURE);
}
}
int main(int argc, char *argv[])
{
int rank, size;
#if ADIOS2_USE_MPI
int provided;
// MPI_THREAD_MULTIPLE is only required if you enable the SST MPI_DP
MPI_Init_thread(&argc, &argv, MPI_THREAD_MULTIPLE, &provided);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
#else
rank = 0;
size = 1;
#endif
adios2_error errio;
// application input, data in heap
const size_t Nx = 10;
float *myFloats;
myFloats = malloc(sizeof(float) * Nx);
unsigned int i;
for (i = 0; i < Nx; ++i)
{
myFloats[i] = (float)i;
}
#if ADIOS2_USE_MPI
adios2_adios *adios = adios2_init_mpi(MPI_COMM_WORLD);
#else
adios2_adios *adios = adios2_init_serial();
#endif
adios2_step_status err;
check_handler(adios, "adios");
adios2_io *io = adios2_declare_io(adios, "BPFile_Write");
check_handler(io, "io");
// dims are allocated in the stack
size_t shape[1];
shape[0] = (size_t)size * Nx;
size_t start[1];
start[0] = (size_t)rank * Nx;
size_t count[1];
count[0] = Nx;
adios2_variable *variable = adios2_define_variable(io, "bpFloats", adios2_type_float, 1, shape,
start, count, adios2_constant_dims_true);
check_handler(variable, "variable");
adios2_engine *engine = adios2_open(io, "myVector_c.bp", adios2_mode_write);
check_handler(engine, "engine");
adios2_begin_step(engine, adios2_step_mode_append, 0.0f, &err);
errio = adios2_put(engine, variable, myFloats, adios2_mode_deferred);
check_error(errio);
adios2_end_step(engine);
errio = adios2_close(engine);
check_error(errio);
// deallocate adios
errio = adios2_finalize(adios);
check_error(errio);
free(myFloats);
#if ADIOS2_USE_MPI
MPI_Finalize();
#endif
return 0;
}
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